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Date: Wed, 01 Feb 2017 10:09:19 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: mp3splt: NULL pointer dereference in free_options (options_manager.c)
Description:
mp3splt is a command line utility to split mp3 and ogg files without decoding.
A fuzz on it discovered a NULL pointer access.
The complete ASan output:
# mp3splt -P -f -t 0.1 -a $FILE
==3026==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x00000041ea65 bp 0x331bdacc2c238b55 sp 0x7fff34d2c400 T0)
#0 0x41ea64 in atomic_compare_exchange_strong /tmp/portage/sys-
devel/llvm-3.9.0-r1/work/llvm-3.9.0.src/projects/compiler-
rt/lib/asan/../sanitizer_common/sanitizer_atomic_clang.h:81
#1 0x41ea64 in
__asan::Allocator::AtomicallySetQuarantineFlagIfAllocated(__asan::AsanChunk*,
void*, __sanitizer::BufferedStackTrace*) /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_allocator.cc:468
#2 0x41ea64 in __asan::Allocator::Deallocate(void*, unsigned long,
__sanitizer::BufferedStackTrace*, __asan::AllocType) /tmp/portage/sys-
devel/llvm-3.9.0-r1/work/llvm-3.9.0.src/projects/compiler-
rt/lib/asan/asan_allocator.cc:522
#3 0x41ea64 in __asan::asan_free(void*, __sanitizer::BufferedStackTrace*,
__asan::AllocType) /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_allocator.cc:725
#4 0x4d374c in free /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:50
#5 0x50db0e in free_options /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/options_manager.c:61:9
#6 0x515623 in free_main_struct /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/data_manager.c:74:7
#7 0x50ffa5 in process_confirmation_error /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/print_utils.c:266:7
#8 0x51df29 in main /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/mp3splt.c:873:9
#9 0x7f8a687f861f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
#10 0x41ad08 in _init (/usr/bin/mp3splt+0x41ad08)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-
rt/lib/asan/../sanitizer_common/sanitizer_atomic_clang.h:81 in
atomic_compare_exchange_strong
==3026==ABORTING
Affected version:
0.9.2
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00127-mp3splt-nullptr-free_options
Timeline:
2017-01-01: privately poked upstream about
2017-02-01: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/02/01/mp3splt-null-pointer-dereference-in-free_options-options_manager-c
--
Agostino Sarubbo
Gentoo Linux Developer
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